<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>flex 布局解决两栏问题</title>
  <style>
      div {
          height: 500px;
      }

      .container {
          display: flex;
          justify-content: left;
      }

      .left {
          width: 300px;
          background: red;
      }

      .right {
          flex: 1;
          background: green;
      }
  </style>
</head>
<body>
<div class="container">
  <div class="left"></div>
  <div class="right"></div>
</div>
</body>
</html>
